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Manuscript Title: Monte Carlo code PARJET to simulate e+e--annihilation events via QCD jets.
Authors: S. Ritter
Program title: PARJET
Catalogue identifier: ACFR_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 31(1984)401
Programming language: Fortran.
Computer: ESER.
Operating system: MVT 6.1.
RAM: 150K words
Word size: 32
Keywords: Elementary, Particle physics, Monte carlo, Phase space, E+e--annihilation, Jets qcd, Hadronization, Chain decay model, Scattering.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
ACFQ_v1_0 BAMJET CPC 31(1984)393
ACFS_v1_0 DECAY CPC 31(1984)411

Nature of problem:
In high energy e+e- collisions quark-antiquark pairs are produced, which fragment into the observed hadrons. The Monte Carlo code PARJET simulates exclusive hadronic final states produced in e+e--annihilation via a virtual photon by two steps: (i) the fragmentation of the original quark-antiquark pair into further partons using results of perturbative QCD in the leading logarithmic approximation (LLA) and (ii) the transition of these parton jets into hadrons on the basis of a chain decay model.

Solution method:
The fragmentation of the initial quark-antiquark pair into further partons as well as the transition into hadrons is simulated by a Monte- Carlo model.

Restrictions:
The model is not optimized to describe isotropic events as they occur below square root s ~~ 5 GeV in e+e- -annihilation. Bottom quarks have been neglected.

Running time:
The running time depends strongly on the centre of mass energy square root s. Simulating e.g. one event at square root s ~~ 50 GeV one needs about 1.0 second of central processor time on an ESER 1040 computer.